[CI] Gather information about platform in Linux tests workflows

[lukaszstolarczuk]

• use get_system_info.sh script broadly, not only in UR
• remove now redundant UR's install_hwloc.sh script

[lukaszstolarczuk]

I wanted to add this only for benchmarks, but it spammed our action's output, so I decided to put it here as a seperate step; please let me know if you don't mind printing this for all tests workflows here...?

[sarnex]

I don't mind, but can you explain the use case/benefit from running this script? There's so much information I'm not sure what I would do with it. Thanks

[lukaszstolarczuk]

last use case we had: perf results changed, we didn't know what was causing it; kernel upgrade was the culprit, but it took us a while - if we had history of platform information from recent jobs we would probably get to the root cause a little faster.

I know, there's a lot of info, but sometimes we may use packages info, sometimes kernel or OS info. It proved to be useful in UR workflows.

[lukaszstolarczuk]

example run in E2E: https://github.com/intel/llvm/actions/runs/22393898078/job/64823932415?pr=21353#step:21:1
example run in UR: https://github.com/intel/llvm/actions/runs/22393898073/job/64824020219?pr=21353#step:14:1

[lukaszstolarczuk]

failed CI doesn't seem to be my fault, please review